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AIO_INIT(3) Linux Programmer's Manual AIO_INIT(3)
NAME
aio_init - asynchronous I/O initialization
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <aio.h>
void aio_init(const struct aioinit *init);
Link with -lrt.
DESCRIPTION
The GNU-specific aio_init() function allows the caller to provide tuning hints to the glibc POSIX AIO implementation. Use of this function is optional, but to
be effective, it must be called before employing any other functions in the POSIX AIO API.
The tuning information is provided in the buffer pointed to by the argument init. This buffer is a structure of the following form:
struct aioinit {
int aio_threads; /* Maximum number of threads */
int aio_num; /* Number of expected simultaneous
requests */
int aio_locks; /* Not used */
int aio_usedba; /* Not used */
int aio_debug; /* Not used */
int aio_numusers; /* Not used */
int aio_idle_time; /* Number of seconds before idle thread
terminates (since glibc 2.2) */
int aio_reserved;
};
The following fields are used in the aioinit structure:
aio_threads
This field specifies the maximum number of worker threads that may be used by the implementation. If the number of outstanding I/O operations exceeds
this limit, then excess operations will be queued until a worker thread becomes free. If this field is specified with a value less than 1, the value 1 is
used. The default value is 20.
aio_num
This field should specify the maximum number of simultaneous I/O requests that the caller expects to enqueue. If a value less than 32 is specified for
this field, it is rounded up to 32. The default value is 64.
aio_idle_time
This field specifies the amount of time in seconds that a worker thread should wait for further requests before terminating, after having completed a pre‐
vious request. The default value is 1.
VERSIONS
The aio_init() function is available since glibc 2.1.
CONFORMING TO
This function is a GNU extension.
SEE ALSO
aio(7)
Linux 2020-08-13 AIO_INIT(3)